I reached the 500th post to my Locks on Toilets group on Flickr, by photographing the inside of a rather curious-looking loo in Can Tho, Vietnam (I'm travelling around South East Asia at the moment - as I'm writing this, I'm in Saigon, but am about to board a plane tomorrow, heading for Thailand after a month in Vietnam).

That's a lot of collecting photos, from dozens of countries. And it's been pretty good fun in the process, too.